A new policy that will (hopefully) make things much easier on users: http://www.forbes.com/sites/gordonkelly/2015/10/13/microsoft-windows-10-new-upgrade-rules/?utm_campaign=yahootix&partner=yahootix. See also: http://blogs.windows.com/windowsexperience/2015/10/12/announcing-windows-10-insider-preview-build-10565/. Note that it talks of the current insider build and apparently doesn't include the RTM build and is not clear whether this will be the case for the upcoming threshold2 and redstone builds.
We have received a lot of feedback from Insiders on making it easier to activate Windows 10 on devices that take advantage of the free upgrade offer to genuine Windows by using existing Windows 7, Windows 8 or Windows 8.1 product keys. If you install this build of the Windows 10 Insider Preview on a PC and it doesn't automatically activate, you can enter the product key from Windows 7, Windows 8 or Windows 8.1 used to activate the prior Windows version on the same device to activate Windows 10 by going to Settings > Update & security > Activation and selecting Change Product Key. If you do a clean install of Windows 10 by booting off the media, you can also enter the product key from prior Windows versions on qualifying devices during setup.
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"The mass of men lead lives of quiet desperation." -- Henry David Thoreau
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